Pediatric Surgery Practice Questions

Q: Bilious vomiting is seen in all conditions except?

Pyloric stenosis. **Explanation:** The key to answering this question lies in the anatomical relationship between the **Ampulla of Vater** (where the common bile duct enters the second part of the duodenum) and the site of obstruction. **1. Why Pyloric Stenosis is the correct answer:** In **Congenital Hypertrophic Pyloric Stenosis (CHPS)**, the obstruction occurs at the pylorus, which is **proximal** to the Ampulla of Vater. Since the gastric outlet is blocked before bile can enter the gastrointestinal tract, the vomitus contains only gastric contents and mucus. Therefore, the hallmark of CHPS is **non-bilious, projectile vomiting**, typically appearing between 3–6 weeks of life. **2. Why the other options are incorrect:** * **Duodenal Atresia:** Most cases (85%) occur distal to the Ampulla of Vater. Thus, bile mixes with the intestinal contents, leading to **bilious vomiting**. It is classically associated with the "Double Bubble" sign on X-ray. * **Jejunal Atresia:** Since the obstruction is further down in the small intestine (distal to the duodenum), bile is always present in the refluxed material. * **Volvulus of the Small Intestine:** Midgut volvulus usually involves the small bowel distal to the duodenum. Sudden onset of bilious vomiting in a previously healthy neonate is considered midgut volvulus until proven otherwise. **Clinical Pearls for NEET-PG:** * **Metabolic Abnormality in CHPS:** Hypochloremic, hypokalemic, metabolic alkalosis with paradoxical aciduria. * **Physical Exam:** A palpable "olive-shaped" mass in the epigastrium is pathognomonic for CHPS. * **Rule of Thumb:** Any obstruction **distal** to the second part of the duodenum presents with **bilious** vomiting; any obstruction **proximal** to it presents with **non-bilious** vomiting.

Q: Anorectal malformations include all of the following except?

Coloanal fistula. Anorectal malformations (ARMs) are a spectrum of congenital defects resulting from the abnormal development of the urorectal septum during embryogenesis. **Why "Coloanal fistula" is the correct answer:** A **coloanal fistula** is typically an acquired condition (often a complication of surgery, inflammatory bowel disease, or malignancy) rather than a congenital malformation. In ARMs, the rectum—not the colon—is the structure that fails to descend or communicates abnormally with the urogenital tract. Therefore, the term used in classification is **recto-** (e.g., rectourethral, rectovestibular), not **colo-**. **Explanation of other options:** * **Rectourethral fistula:** This is the most common type of "high" or "intermediate" ARM in males. The rectum communicates with the prostatic or bulbar urethra. * **Imperforate anus:** This is the classic clinical presentation of ARMs where the anal opening is absent or obstructed by a membrane. * **Anal stenosis:** A "low" variety of ARM where the anal opening is present but pathologically narrow due to incomplete canalization. **High-Yield Clinical Pearls for NEET-PG:** * **VACTERL Association:** Always screen infants with ARM for other anomalies (Vertebral, Anal, Cardiac, Tracheo-Esophageal, Renal, and Limb). * **Investigation of Choice:** An **Invertogram** (Wangensteen-Rice technique) is traditionally used to determine the level of the lesion, but it must be performed only after **18–24 hours** of life to allow bowel gas to reach the distal rectum. * **Management:** Low anomalies are managed with a primary **Anoplasty**. High anomalies require a staged approach: Initial diverting colostomy, followed by **PSARP (Posterior Sagittal Anorectoplasty/Peña Procedure)**, and finally colostomy closure.

Q: Regarding pectus excavatum, all of the following are true except?

Gross cardiovascular system dysfunction. **Explanation:** **Pectus excavatum** (Funnel chest) is the most common congenital chest wall deformity, characterized by a posterior depression of the sternum and adjacent costal cartilages. **Why Option A is the Correct Answer (The "Except"):** While the heart is often displaced to the left and may show a "pancake" appearance on imaging, **gross cardiovascular dysfunction is rare**. Most patients are asymptomatic at rest. While some may experience a slight decrease in stroke volume or mitral valve prolapse during extreme exercise, they do not typically present with gross heart failure or significant hemodynamic instability. Therefore, stating they have "gross" dysfunction is clinically incorrect. **Analysis of Other Options:** * **B. Decrease in lung capacity:** The inward displacement of the sternum restricts the thoracic volume, leading to a **restrictive lung defect**. This results in a measurable decrease in total lung capacity and vital capacity. * **C. Cosmetic deformity:** This is the most common presenting complaint. The "sunken chest" appearance often leads to significant psychosocial distress and body image issues, especially in adolescents. * **D. Depression in the chest:** This is the hallmark anatomical feature of the condition, caused by the overgrowth of costal cartilages pushing the sternum inward. **High-Yield Clinical Pearls for NEET-PG:** * **Haller Index:** Used to assess severity via CT scan (Transverse diameter / Anteroposterior diameter). A score **>3.25** is considered severe and may require surgery. * **Surgical Procedures:** * **Ravitch Procedure:** Open repair involving cartilage resection. * **Nuss Procedure:** Minimally invasive repair using a retrosternal metal bar (current gold standard). * **Associated Conditions:** Frequently associated with Marfan syndrome and Ehlers-Danlos syndrome.

Q: A child presents with recurrent abdominal pain and bilious vomiting. The condition was diagnosed by barium follow-through. Surgery revealed mesenteric widening, appendicectomy, and division of Ladd's bands. What is the diagnosis?

Malrotation. **Explanation:** The clinical presentation of **bilious vomiting** and recurrent abdominal pain in a child is a classic red flag for **Malrotation with or without Midgut Volvulus**. **1. Why Malrotation is correct:** Malrotation occurs due to the failure of the normal 270° counter-clockwise rotation of the midgut during embryonic development. This results in: * **Narrow Mesenteric Base:** Predisposing the gut to volvulus. * **Ladd’s Bands:** Abnormal peritoneal bands extending from the cecum (located in the RUQ) across the duodenum, causing extrinsic obstruction. * **Surgical Management (Ladd’s Procedure):** The standard treatment involves counter-clockwise detorsion, **division of Ladd’s bands**, **widening of the mesenteric base**, and a prophylactic **appendicectomy** (as the appendix will be in an abnormal position, making future diagnosis of appendicitis difficult). **2. Why other options are incorrect:** * **Recurrent Caecal Volvulus:** Rare in children; it involves twisting of the cecum itself, not the entire midgut, and wouldn't typically involve the division of Ladd's bands. * **Recurrent Appendicitis:** While it causes pain, it does not cause bilious vomiting or require mesenteric widening. * **Stricture TB:** Usually presents with features of chronic intestinal obstruction and weight loss; barium studies would show "string signs" or "pulled up cecum," but the surgical steps described (Ladd's bands) are pathognomonic for malrotation. **High-Yield Pearls for NEET-PG:** * **Gold Standard Investigation:** Upper GI Contrast Study (Barium Swallow/Follow-through) showing the **"Corkscrew appearance"** of the duodenum or the Duodenojejunal (DJ) flexure failing to cross the midline. * **Ladd’s Procedure:** Does *not* restore normal anatomy but places the small bowel on the right and the large bowel on the left. * **Whirlpool Sign:** Seen on Doppler Ultrasound, indicating midgut volvulus.

Q: A 3-year-old boy presents with a soft, anterior, midline cervical mass. The mass moves upward when the patient is asked to protrude his tongue. What is the most likely diagnosis?

Thyroglossal duct cyst. **Explanation:** The clinical presentation is classic for a **Thyroglossal Duct Cyst (TGDC)**. **Why Option A is correct:** The thyroid gland originates at the *foramen cecum* (base of the tongue) and descends to its adult position in the neck. A TGDC occurs when a segment of this descent tract fails to involute. * **Location:** It is the most common congenital midline neck mass. * **Pathognomonic Sign:** Because the duct is anatomically connected to the hyoid bone and the base of the tongue, the cyst **moves upward during tongue protrusion** and swallowing. **Why the other options are incorrect:** * **Option B & D:** Defects or fistulae of the 3rd or 6th pharyngeal arches typically present as lateral neck masses or internal sinus tracts (often associated with the pyriform sinus), not midline masses that move with the tongue. * **Option C:** A **Branchial Cyst** (specifically from the 2nd arch, the most common type) presents as a soft mass along the **anterior border of the sternocleidomastoid muscle** (lateral neck). It does not move with tongue protrusion. **High-Yield Clinical Pearls for NEET-PG:** * **Sistrunk Operation:** The definitive surgical treatment. It involves excision of the cyst, the entire tract, and the **central portion of the hyoid bone** to prevent recurrence. * **Ectopic Thyroid:** Always perform an ultrasound before surgery to ensure the cyst isn't the patient’s only functioning thyroid tissue. * **Complication:** If infected, it may rupture to form a thyroglossal fistula. * **Malignancy:** Though rare (<1%), the most common cancer arising in a TGDC is **Papillary Thyroid Carcinoma**.

Q: What is the least common type of intussusception?

Multiple. **Explanation:** Intussusception is the telescoping of one segment of the intestine (intussusceptum) into an adjacent segment (intussuscipiens). It is the most common cause of intestinal obstruction in infants (6–36 months). **Why "Multiple" is the correct answer:** Intussusception typically occurs at a single site. **Multiple intussusceptions** (where telescoping occurs at two or more separate, non-contiguous locations simultaneously) are extremely rare. When they do occur, they are often associated with specific pathological lead points (PLPs) like Peutz-Jeghers syndrome, Henoch-Schönlein purpura, or multiple lymphoid hyperplasia. **Analysis of other options:** * **Ileoilecolic (Option D):** This is the **second most common** type. It occurs when an ileoileal intussusception subsequently prolapses through the ileocecal valve into the colon. * **Ileoileal (Option C):** This involves only the small bowel. While common in specific scenarios (like postoperative intussusception or in older children with a Meckel’s diverticulum), it is more frequent than the multiple type. * **Colocolic (Option B):** This involves only the large bowel. It is less common than ileocolic but occurs more frequently than multiple synchronous intussusceptions, often seen in older children with colonic polyps. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Type:** **Ileocolic** (accounts for ~80-90% of cases). * **Classic Triad:** Intermittent abdominal pain, "sausage-shaped" mass (usually in the right upper quadrant), and "red currant jelly" stools. * **Diagnosis:** Ultrasound is the gold standard (shows the **Target/Donut sign** or **Pseudokidney sign**). * **Management:** Non-operative reduction (Air or Hydrostatic enema) is the first line if there are no signs of peritonitis or perforation.

Q: Which of the following procedures is NOT performed in a case of Hirschsprung's disease?

Fasanella-Servat procedure. **Explanation:** Hirschsprung’s disease (Congenital Aganglionic Megacolon) is characterized by the absence of ganglion cells in the myenteric and submucosal plexuses. The definitive treatment involves a "pull-through" procedure to remove the aganglionic segment and bring functional, ganglionated bowel down to the anus. **Why Option C is Correct:** The **Fasanella-Servat procedure** is an ophthalmic surgery used to treat **mild ptosis**. It involves the excision of the superior border of the tarsus, the lower border of the Müller muscle, and the overlying conjunctiva. It has no relevance to pediatric surgery or the gastrointestinal tract. **Why the Other Options are Incorrect:** The following are the three classic definitive pull-through operations for Hirschsprung’s disease: * **Swenson’s Operation (A):** The original procedure involving proctectomy and end-to-end anastomosis. It requires full dissection of the rectum close to the pelvic nerves. * **Duhamel’s Operation (B):** A "retro-rectal" approach where the ganglionic bowel is brought down behind the rectum, creating a side-to-side anastomosis. This avoids anterior pelvic dissection. * **Soave’s Operation (D):** An "endorectal" pull-through where the rectal mucosa is stripped, and the ganglionic bowel is pulled through the remaining muscular cuff, protecting pelvic nerves. **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Rectal suction biopsy (shows absence of ganglion cells and hypertrophied nerve bundles). * **Most Common Site:** Rectosigmoid region (Short-segment disease). * **Modern Trend:** Transanal Endorectal Pull-Through (TEPT) is now frequently performed as a single-stage minimally invasive procedure. * **Associated Condition:** Down Syndrome (Trisomy 21) is seen in approximately 10% of cases.

Question 1

Bilious vomiting is seen in all conditions except?

Accepted Answer

Pyloric stenosis

Answer

Jejunal atresia

Answer

Volvulus of small intestine

Answer

Duodenal atresia

Question 2

Anorectal malformations include all of the following except?

Accepted Answer

Coloanal fistula

Answer

Rectourethral fistula

Answer

Imperforate anus

Answer

Anal stenosis

Question 3

Regarding pectus excavatum, all of the following are true except?

Accepted Answer

Gross cardiovascular system dysfunction

Answer

Decrease in lung capacity

Answer

Cosmetic deformity

Answer

Depression in the chest

Question 4

When can an X-ray detect congenital anorectal malformation?

Accepted Answer

24-48 hours after birth

Answer

Immediately after birth

Answer

48-72 hours after birth

Answer

After 72 hours

Question 5

A child presents with recurrent abdominal pain and bilious vomiting. The condition was diagnosed by barium follow-through. Surgery revealed mesenteric widening, appendicectomy, and division of Ladd's bands. What is the diagnosis?

Accepted Answer

Malrotation

Answer

Recurrent caecal volvulus

Answer

Recurrent appendicitis

Answer

Stricture TB

Question 6

A 3-year-old boy presents with a soft, anterior, midline cervical mass. The mass moves upward when the patient is asked to protrude his tongue. What is the most likely diagnosis?

Accepted Answer

Thyroglossal duct cyst

Answer

Defect in sixth pharyngeal arch

Answer

Branchial cyst

Answer

Cystic fistula of the third pharyngeal arch

Question 7

What is the least common type of intussusception?

Accepted Answer

Multiple

Answer

Colocolic

Answer

Ileoileal

Answer

Ileoilecolic

Question 8

All of the following statements regarding hypospadias are true, EXCEPT?

Accepted Answer

Surgery is not required in the glandular variety.

Answer

Circumcision in infancy is contraindicated.

Answer

Elective surgical correction should be deferred until after puberty.

Answer

All of the above are true statements.

Question 9

What is the standard treatment for a large hydrocele in an infant?

Accepted Answer

Herniotomy

Answer

Repeated aspirations

Answer

Ligation of the sac at the opening of the inguinal canal

Answer

Eversion of the sac

Question 10

Which of the following procedures is NOT performed in a case of Hirschsprung's disease?

Accepted Answer

Fasanella-Servat procedure

Answer

Swenson's operation

Answer

Duhamel's operation

Answer

Soave's operation

Pediatric Surgery — MCQs

Pediatric Surgery — MCQs

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